US10562746B2 - Mast support device - Google Patents
Mast support device Download PDFInfo
- Publication number
- US10562746B2 US10562746B2 US15/795,131 US201715795131A US10562746B2 US 10562746 B2 US10562746 B2 US 10562746B2 US 201715795131 A US201715795131 A US 201715795131A US 10562746 B2 US10562746 B2 US 10562746B2
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- US
- United States
- Prior art keywords
- channel
- moveable member
- mast
- impact dampening
- secured
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
Links
- 239000004033 plastic Substances 0.000 claims description 12
- 229920003023 plastic Polymers 0.000 claims description 12
- 238000013016 damping Methods 0.000 claims 4
- 238000000034 method Methods 0.000 claims 4
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/08—Masts; Guides; Chains
Definitions
- the present disclosure relates to masts for lift trucks, and in particular to devices for relieving lift chain tension for such masts.
- lift chains on certain lift truck masts are typically under constant, or nearly constant, tension.
- the lift chains may be under constant tension.
- some lift trucks in certain applications, such as empty container handling the lift chains rarely, if ever, are relieved from being tensioned.
- Some lift truck lift chains therefore carry a relatively large proportion of the rated load for a lift truck, even when not lifting a load, because of the construction, kinematics, dimensions, and weight of attachments secured to the mast.
- the present inventors have also recognized that maintaining lift chains under constant, or nearly constant, tension may inhibit effective lubrication of such chains.
- the present inventors have also recognized that maintaining lift chains under constant, or nearly constant, tension typically reduces lift chain life.
- FIG. 1 is a front, left orthogonal sectional view of an example two-stage mast including impact dampening blocks.
- FIG. 2 is a view of the bottom portion of FIG. 1 with the inner mast stage removed.
- FIG. 3 is a view of the bottom portion of FIG. 1 with the inner mast stage illustrated.
- FIG. 4 is a view of the bottom portion of FIG. 1 with the inner mast stage and an attachment roller illustrated.
- FIG. 4A is a partial cut-away view of the embodiment of FIG. 1 showing an attachment roller engaging an impact dampening block.
- FIG. 4B is a close-up view of the attachment roller engaging the impact dampening block of FIG. 4A .
- FIG. 5 is a close-up view of FIG. 1 .
- FIG. 6 is a front view of the impact dampening block of FIG. 2 .
- FIG. 7 is a top view of the impact dampening block of FIG. 6 .
- FIG. 8 is a front view of another embodiment of an impact dampening block.
- FIG. 8 a is a view of another embodiment of an impact dampening block.
- FIG. 9 is a side cut-away view of another embodiment.
- FIG. 10 is a right-side schematic illustration of another embodiment.
- a two-stage mast 5 may carry a moveable member, such as empty container handling attachment 10 , which is vertically translatable along the two-stage mast 5 via one or more lift chains 15 .
- the empty container handling attachment 10 may be constrained in channels 20 that are formed in mast columns 25 .
- the moveable member may be other suitable attachments.
- an impact dampening block 30 may be located proximate to the bottom of an outer mast section 35 . Only one impact dampening block 30 is illustrated in FIG. 2 proximate one of the mast columns 40 , however an identical impact dampening block 30 is included proximate the other mast column 40 .
- Each mast column 40 includes a channel 45 formed therein.
- each impact dampening block 30 may be located proximate an end of a channel 45 that is proximate to the ground such that each dampening block 30 is aligned with a center of its corresponding channel 45 .
- the dampening blocks 30 may not be contained within the footprint of channel 45 , but may be offset such that each dampening block 30 is contained, at least partially, within the footprint of channel 20 ( FIG. 3 ).
- impact dampening blocks 30 may be secured to end caps 50 .
- end caps 50 are formed as part of plate 55 that is secured to the outer mast section 35 , via welding, for example.
- the impact dampening blocks 30 are bolted to the end caps 50 , however, other suitable manners for securing the impact dampening blocks 30 may be used, for example, adhesives.
- impact dampening blocks, such as impact dampening blocks 30 may be secured within a footprint of a channel other than by being secured to an end cap, for example, by being secured to one of the walls forming channel 20 .
- Impact dampening blocks 30 may be located on end caps 50 such that the impact dampening blocks 30 do not interfere with movement of the inner mast section 37 .
- mast columns 25 of the inner mast section 37 contact the plate 55 without contacting the impact dampening blocks 30 .
- the impact dampening blocks 30 are located on the end caps 50 such that each impact dampening block 30 is substantially centered within its corresponding channel 20 when the inner mast section 37 is at its fully lowered position. Such centering may locate each impact dampening block 30 to receive a roller 60 ( FIG. 4 ).
- impact dampening blocks, such as impact dampening blocks 30 may contact portions of an inner mast section, such as inner mast section 37 .
- each impact dampening block 30 may include a cut-out 65 ( FIGS. 6 and 7 ) that matches the outer contour of the rollers 60 , which may facilitate self-centering of the rollers 60 with respect to the impact dampening blocks 30 .
- the container handling attachment 10 may be further lowered such that the impact dampening blocks 30 compress, and thus receive some of the weight of the container handling attachment 10 .
- the lift chain 15 has at least some of the tension removed.
- lowering the container handling attachment 10 onto the impact dampening blocks 30 relieves at least some of the tension from the lift chain 15 .
- container handling attachment 10 may weigh approximately 4,500 kilograms (kg).
- the lift chain 15 itself may weigh approximately 16.4 kg.
- the lift chain 15 may only need to bear its own weight (i.e., approximately 16.4 kg), which may result in an approximately 99.28% reduction in weight carried by each of the two chains, which may result in a corresponding relief in tension from the lift chain 15 .
- container handling attachment may weigh approximately 6,500 kg.
- the lift chain 15 itself may weight approximately 26.2 kg.
- the lift chain 15 may only need to bear its own weight (i.e., approximately 26.2 kg), which may result in an approximately 99.20% reduction in weight carried by each of the two chains, which may result in a corresponding relief in tension from the lift chain 15 .
- the impact dampening blocks 30 are made of a plastic material, preferably nylon or ultra-high-molecular-weight polyethylene, have a height of approximately 40 millimeters (mm), a width of approximately 70 mm, a length of approximately 200 mm, and a cut-out 65 with a diameter of approximately 283 mm.
- a plastic material preferably nylon or ultra-high-molecular-weight polyethylene
- springs may be included to facilitate dampening when the moveable member contacts the impact dampening blocks, for example, coil springs may be included around bolts that hold the impact dampening block body in place.
- FIG. 8 illustrates an example embodiment where the impact dampening blocks 30 A are a composite between a metallic section 70 and a plastic section 75 .
- an adhesive may be used to secure the plastic section 75 to the metallic section 70 .
- a spring such as a wave spring 72 , or a leaf spring (not illustrated) or coil spring (not illustrated), may be located between an impact dampening block body (such as metallic section 70 A) and an end cap (such as plastic section 75 A).
- FIG. 9 illustrates an alternate embodiment where the impact dampening blocks 30 B may be formed from two parts that bookend a roller 60 B when the roller 60 B is lowered onto the impact dampening blocks 30 B.
- Impact dampening blocks 30 B are optionally attached to end caps 50 B and are located such that the walls of channel 20 B do not contact the impact dampening blocks 30 B.
- the weight of a container handling attachment (not illustrated in FIG. 9 ) is borne by the plate 55 B when the container handling attachment contacts the impact dampening blocks 30 B.
- Other suitable shapes and arrangements may be used for form impact dampening blocks.
- the outer mast stage 105 comprises two mast columns 110 (only the right mast column 110 is shown).
- the inner mast stage 115 comprises two mast columns 120 (only the right mast column 120 is shown).
- An attachment 125 is moveably attached to the inner mast stage 115 .
- Hydraulic cylinders 130 move the inner mast stage 120 with respect to the outer mast stage 105 .
- lift chains 140 cause the attachment 125 to move with respect to the inner mast stage 115 .
- dampening blocks 30 may be located within the footprint of channel 20 ( FIG. 3 )
- a first set of dampening blocks may be located in the footprint of channels of the mast columns 110 and a second set of dampening blocks may be located in the footprint of channels of the mast columns 120 .
- the first set of dampening blocks may receive rollers attached to the inner mast stage 115 (which is a moveable member) when the inner mast stage 115 is lowered and its rollers engage the first set of dampening blocks.
- the second set of dampening blocks may receive rollers attached to the attachment 125 (which is a moveable member) to relieve, or partially relieve, tension from lift chains 140 when the attachment 125 is lowered and its rollers engage the second set of dampening blocks.
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
Description
Claims (20)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/795,131 US10562746B2 (en) | 2016-10-28 | 2017-10-26 | Mast support device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201662414184P | 2016-10-28 | 2016-10-28 | |
US15/795,131 US10562746B2 (en) | 2016-10-28 | 2017-10-26 | Mast support device |
Publications (2)
Publication Number | Publication Date |
---|---|
US20180118544A1 US20180118544A1 (en) | 2018-05-03 |
US10562746B2 true US10562746B2 (en) | 2020-02-18 |
Family
ID=60186171
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/795,131 Active 2038-07-21 US10562746B2 (en) | 2016-10-28 | 2017-10-26 | Mast support device |
Country Status (4)
Country | Link |
---|---|
US (1) | US10562746B2 (en) |
EP (1) | EP3315455B1 (en) |
CN (1) | CN207618924U (en) |
AU (1) | AU2017251821B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3315455B1 (en) * | 2016-10-28 | 2019-11-27 | Hyster-Yale Group, Inc. | Mast support device |
Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3961689A (en) * | 1975-04-18 | 1976-06-08 | Towmotor Corporation | Spacer and noise suppressor cushions for lift truck mast units |
US4848519A (en) * | 1984-12-24 | 1989-07-18 | Otis Elevator Company | Structural support for hydraulic elevator car |
US5657834A (en) * | 1994-08-30 | 1997-08-19 | Crown Equipment Corporation | Mast staging cushion apparatus |
DE19849752A1 (en) | 1998-10-28 | 2000-05-04 | Linde Ag | Fork lift truck with lifting gear which can be angled, with at least one elastic damping element in region of at least one bearing point between lifting gear and frame |
US20020174766A1 (en) * | 2001-05-24 | 2002-11-28 | Norton Kenneth E. | Cushioned actuator |
US6505710B1 (en) * | 1997-10-14 | 2003-01-14 | Nissan Motor Co., Ltd. | Mast apparatus for fork lift trucks |
EP1512662A2 (en) | 2003-09-05 | 2005-03-09 | Jungheinrich Aktiengesellschaft | Damping arrangement for the lifting mast of a lift truck |
US20060027094A1 (en) * | 2004-05-06 | 2006-02-09 | Jungheinrich Aktiengesellschaft | Industrial truck having a piston/cylinder arrangement and improved cylinder mounting |
DE102006053228A1 (en) | 2006-11-11 | 2008-05-15 | Linde Material Handling Gmbh | Lift rod for e.g. fork lift truck, has end stop arranged in area of upper end of stand rod, and designed for balancing play between supporting roller of drive rod and unloaded track of stand rod |
US7523808B2 (en) * | 2006-03-22 | 2009-04-28 | Kabushiki Kaisha Toyota Jidoshokki | Mast assembly in forklift truck |
US20130146396A1 (en) * | 2010-09-01 | 2013-06-13 | Oiles Corporation | Mast assembly for forklift truck |
US20140262626A1 (en) * | 2013-03-14 | 2014-09-18 | The Raymond Corporation | Buckling-Resistant Lift Cylinders |
US20150122585A1 (en) * | 2013-11-05 | 2015-05-07 | Nacco Materials Handling Group, Inc. | Lift chain tension relieving devices and methods |
US20180118544A1 (en) * | 2016-10-28 | 2018-05-03 | Hyster-Yale Group, Inc. | Mast support device |
-
2017
- 2017-10-26 EP EP17198590.6A patent/EP3315455B1/en active Active
- 2017-10-26 US US15/795,131 patent/US10562746B2/en active Active
- 2017-10-27 CN CN201721407295.XU patent/CN207618924U/en active Active
- 2017-10-27 AU AU2017251821A patent/AU2017251821B2/en active Active
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3961689A (en) * | 1975-04-18 | 1976-06-08 | Towmotor Corporation | Spacer and noise suppressor cushions for lift truck mast units |
US4848519A (en) * | 1984-12-24 | 1989-07-18 | Otis Elevator Company | Structural support for hydraulic elevator car |
US5657834A (en) * | 1994-08-30 | 1997-08-19 | Crown Equipment Corporation | Mast staging cushion apparatus |
US6505710B1 (en) * | 1997-10-14 | 2003-01-14 | Nissan Motor Co., Ltd. | Mast apparatus for fork lift trucks |
DE19849752A1 (en) | 1998-10-28 | 2000-05-04 | Linde Ag | Fork lift truck with lifting gear which can be angled, with at least one elastic damping element in region of at least one bearing point between lifting gear and frame |
US20020174766A1 (en) * | 2001-05-24 | 2002-11-28 | Norton Kenneth E. | Cushioned actuator |
EP1512662A2 (en) | 2003-09-05 | 2005-03-09 | Jungheinrich Aktiengesellschaft | Damping arrangement for the lifting mast of a lift truck |
US20060027094A1 (en) * | 2004-05-06 | 2006-02-09 | Jungheinrich Aktiengesellschaft | Industrial truck having a piston/cylinder arrangement and improved cylinder mounting |
US7523808B2 (en) * | 2006-03-22 | 2009-04-28 | Kabushiki Kaisha Toyota Jidoshokki | Mast assembly in forklift truck |
DE102006053228A1 (en) | 2006-11-11 | 2008-05-15 | Linde Material Handling Gmbh | Lift rod for e.g. fork lift truck, has end stop arranged in area of upper end of stand rod, and designed for balancing play between supporting roller of drive rod and unloaded track of stand rod |
US20130146396A1 (en) * | 2010-09-01 | 2013-06-13 | Oiles Corporation | Mast assembly for forklift truck |
US20140262626A1 (en) * | 2013-03-14 | 2014-09-18 | The Raymond Corporation | Buckling-Resistant Lift Cylinders |
US20150122585A1 (en) * | 2013-11-05 | 2015-05-07 | Nacco Materials Handling Group, Inc. | Lift chain tension relieving devices and methods |
US20180118544A1 (en) * | 2016-10-28 | 2018-05-03 | Hyster-Yale Group, Inc. | Mast support device |
Non-Patent Citations (1)
Title |
---|
European Search Report; EP App. No. 17198590.6; dated Mar. 27, 2018; pp. 1-7. |
Also Published As
Publication number | Publication date |
---|---|
AU2017251821B2 (en) | 2023-01-05 |
EP3315455A1 (en) | 2018-05-02 |
US20180118544A1 (en) | 2018-05-03 |
AU2017251821A1 (en) | 2018-05-17 |
EP3315455B1 (en) | 2019-11-27 |
CN207618924U (en) | 2018-07-17 |
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Owner name: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT, NORTH CAROLINA Free format text: SUPPLEMENTAL SECURITY AGREEMENT;ASSIGNORS:HYSTER-YALE GROUP, INC.;NUVERA FUEL CELLS, LLC;REEL/FRAME:056970/0230 Effective date: 20210528 |
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